考虑土-结构相互作用大型动力机器基础三维有限元分析

3D FINITE ELEMENT ANALYSIS OF LARGE DYNAMIC MACHINE FOUNDATION CONSIDERING SOIL-STRUCTURE INTERACTION

本文提出了考虑土-结构相互作用计算大型机器基础动力反应的三维有限元方法.该方法将动力机器基础与周围地基作为一个完整的研究对象,将基础作为粘弹性体反映基础变形,建立粘-弹性人工边界模拟半无限地基的辐射阻尼和远场地球介质的弹性恢复性能,并通过构造等效弹簧实体元使这一人工边界在商业有限元程序中实现。文中进一步将上述方法用于分析燕化高压聚乙稀装置压缩机基础的动力反应，并通过数值试验定量讨论了影响大型机器基础动力反应的主要因素，得出了一些有用的结论。

This paper presents three dimensional finite element method for analysis of dynamic response of large dynamic machine foundation considering soil-structure interaction. Dynamic machine foundation and its surrounding rock are taken as an integrated coupling object. Machine foundation is regarded as viscoelastic body to reflect deformation of foundation. Viscous-spring artificial boundary is constructed which can simulate not only the radiation damping of semi-infinite soil, but also the elasticity recovery capacity of the far field media on the boundary. The equivalent spring solid element is constructed for implementing the artificial boundary with commercial FE program. Analysis of dynamic response of Yanshan LDPE project is performed by the method. Quantitative analysis of major factors which affect dynamic response of large machine foundation is performed by numerical experiments and some useful conclusions are drawn.